Broccoli hybrid px 05181808 and parents thereof

ABSTRACT

The invention provides seed and plants of broccoli hybrid PX 05181808 and the parent lines thereof. The invention thus relates to the plants, seeds and tissue cultures of broccoli hybrid PX 05181808 and the parent lines thereof, and to methods for producing a broccoli plant produced by crossing such plants with themselves or with another broccoli plant, such as a plant of another genotype. The invention further relates to seeds and plants produced by such crossing. The invention further relates to parts of such plants.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of U.S. Provisional Appl. Ser. No. 61/572,271, filed Jun. 15, 2011, and U.S. Provisional Appl. Ser. No. 61/632,821, filed Jan. 20, 2012 the entire disclosures of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to the field of plant breeding and, more specifically, to the development of broccoli hybrid PX 05181808 and the parent broccoli lines BRM 51-1210 and BRL 51-1128.

BACKGROUND OF THE INVENTION

The goal of vegetable breeding is to combine various desirable traits in a single variety/hybrid. Such desirable traits may include any trait deemed beneficial by a grower and/or consumer, including greater yield, resistance to insects or disease, tolerance to environmental stress, and nutritional value.

Breeding techniques take advantage of a plant's method of pollination. There are two general methods of pollination: a plant self-pollinates if pollen from one flower is transferred to the same or another flower of the same plant or plant variety. A plant cross-pollinates if pollen comes to it from a flower of a different plant variety.

Plants that have been self-pollinated and selected for type over many generations become homozygous at almost all gene loci and produce a uniform population of true breeding progeny, a homozygous plant. A cross between two such homozygous plants of different genotypes produces a uniform population of hybrid plants that are heterozygous for many gene loci. Conversely, a cross of two plants each heterozygous at a number of loci produces a population of hybrid plants that differ genetically and are not uniform. The resulting non-uniformity makes performance unpredictable.

The development of uniform varieties requires the development of homozygous inbred plants, the crossing of these inbred plants, and the evaluation of the crosses. Pedigree breeding and recurrent selection are examples of breeding methods that have been used to develop inbred plants from breeding populations. Those breeding methods combine the genetic backgrounds from two or more plants or various other broad-based sources into breeding pools from which new lines and hybrids derived therefrom are developed by selfing and selection of desired phenotypes. The new lines and hybrids are evaluated to determine which of those have commercial potential.

SUMMARY OF THE INVENTION

In one aspect, the present invention provides a broccoli plant of the hybrid designated PX 05181808 the broccoli line BRM 51-1210 or broccoli line BRL 51-1128. Also provided are broccoli plants having all the physiological and morphological characteristics of such a plant. Parts of these broccoli plants are also provided, for example, including pollen, an ovule, a floret, a head, and a cell of the plant.

In another aspect of the invention, a plant of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 comprising an added heritable trait is provided. The heritable trait may comprise a genetic locus that is, for example, a dominant or recessive allele. In one embodiment of the invention, a plant of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 is defined as comprising a single locus conversion. In specific embodiments of the invention, an added genetic locus confers one or more traits such as, for example, herbicide tolerance, insect resistance, disease resistance, and modified carbohydrate metabolism. In further embodiments, the trait may be conferred by a naturally occurring gene introduced into the genome of a line by backcrossing, a natural or induced mutation, or a transgene introduced through genetic transformation techniques into the plant or a progenitor of any previous generation thereof. When introduced through transformation, a genetic locus may comprise one or more genes integrated at a single chromosomal location.

The invention also concerns the seed of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128. The broccoli seed of the invention may be provided, in particular embodiments, as an essentially homogeneous population of broccoli seed of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128. Essentially homogeneous populations of seed are generally free from substantial numbers of other seed. Therefore, seed of hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 may be provided, in certain embodiments of the invention, as forming at least about 97% of the total seed, including at least about 98%, 99% or more of the seed. The seed population may be separately grown to provide an essentially homogeneous population of broccoli plants designated PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128.

In yet another aspect of the invention, a tissue culture of regenerable cells of a broccoli plant of hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 is provided. The tissue culture will preferably be capable of regenerating broccoli plants capable of expressing all of the physiological and morphological characteristics of the starting plant, and of regenerating plants having substantially the same genotype as the starting plant. Examples of some of the physiological and morphological characteristics of the hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 include those traits set forth in the tables herein. The regenerable cells in such tissue cultures may be derived, for example, from embryos, meristems, cotyledons, pollen, leaves, anthers, roots, root tips, pistils, flowers, seed and stalks. Still further, the present invention provides broccoli plants regenerated from a tissue culture of the invention, the plants having all the physiological and morphological characteristics of hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128.

In still yet another aspect of the invention, processes are provided for producing broccoli seeds, plants and parts thereof, which processes generally comprise crossing a first parent broccoli plant with a second parent broccoli plant, wherein at least one of the first or second parent broccoli plants is a plant of broccoli line BRM 51-1210 or broccoli line BRL 51-1128. These processes may be further exemplified as processes for preparing hybrid broccoli seed or plants, wherein a first broccoli plant is crossed with a second broccoli plant of a different, distinct genotype to provide a hybrid that has, as one of its parents, a plant of broccoli line BRM 51-1210 or broccoli line BRL 51-1128. In these processes, crossing will result in the production of seed. The seed production occurs regardless of whether the seed is collected or not.

In one embodiment of the invention, the first step in “crossing” comprises planting seeds of a first and second parent broccoli plant, often in proximity so that pollination will occur for example, mediated by insect vectors. Alternatively, pollen can be transferred manually. Where the plant is self-pollinated, pollination may occur without the need for direct human intervention other than plant cultivation.

A second step may comprise cultivating or growing the seeds of first and second parent broccoli plants into plants that bear flowers. A third step may comprise preventing self-pollination of the plants, such as by emasculating the flowers (i.e., killing or removing the pollen).

A fourth step for a hybrid cross may comprise cross-pollination between the first and second parent broccoli plants. Yet another step comprises harvesting the seeds from at least one of the parent broccoli plants. The harvested seed can be grown to produce a broccoli plant or hybrid broccoli plant.

The present invention also provides the broccoli seeds and plants produced by a process that comprises crossing a first parent broccoli plant with a second parent broccoli plant, wherein at least one of the first or second parent broccoli plants is a plant of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128. In one embodiment of the invention, broccoli seed and plants produced by the process are first generation (F₁) hybrid broccoli seed and plants produced by crossing a plant in accordance with the invention with another, distinct plant. The present invention further contemplates plant parts of such an F₁ hybrid broccoli plant, and methods of use thereof. Therefore, certain exemplary embodiments of the invention provide an F₁ hybrid broccoli plant and seed thereof.

In still yet another aspect, the present invention provides a method of producing a plant derived from hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128, the method comprising the steps of: (a) preparing a progeny plant derived from hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128, wherein said preparing comprises crossing a plant of the hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 with a second plant; and (b) crossing the progeny plant with itself or a second plant to produce a seed of a progeny plant of a subsequent generation. In further embodiments, the method may additionally comprise: (c) growing a progeny plant of a subsequent generation from said seed of a progeny plant of a subsequent generation and crossing the progeny plant of a subsequent generation with itself or a second plant; and repeating the steps for an additional 3-10 generations to produce a plant derived from hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128. The plant derived from hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 may be an inbred line, and the aforementioned repeated crossing steps may be defined as comprising sufficient inbreeding to produce the inbred line. In the method, it may be desirable to select particular plants resulting from step (c) for continued crossing according to steps (b) and (c). By selecting plants having one or more desirable traits, a plant derived from hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 is obtained which possesses some of the desirable traits of the line/hybrid as well as potentially other selected traits.

In certain embodiments, the present invention provides a method of producing food or feed comprising: (a) obtaining a plant of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128, wherein the plant has been cultivated to maturity, and (b) collecting tissue of the plant.

In still yet another aspect of the invention, the genetic complement of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 is provided. The phrase “genetic complement” is used to refer to the aggregate of nucleotide sequences, the expression of which sequences defines the phenotype of, in the present case, a broccoli plant, or a cell or tissue of that plant. A genetic complement thus represents the genetic makeup of a cell, tissue or plant, and a hybrid genetic complement represents the genetic make up of a hybrid cell, tissue or plant. The invention thus provides broccoli plant cells that have a genetic complement in accordance with the broccoli plant cells disclosed herein, and plants, seeds and plants containing such cells.

Plant genetic complements may be assessed by genetic marker profiles, and by the expression of phenotypic traits that are characteristic of the expression of the genetic complement, e.g., isozyme typing profiles. It is understood that hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 could be identified by any of the many well known techniques such as, for example, Simple Sequence Length Polymorphisms (SSLPs) (Williams et al., Nucleic Acids Res., 1 8:6531-6535, 1990), Randomly Amplified Polymorphic DNAs (RAPDs), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Arbitrary Primed Polymerase Chain Reaction (AP-PCR), Amplified Fragment Length Polymorphisms (AFLPs) (EP 534 858, specifically incorporated herein by reference in its entirety), and Single Nucleotide Polymorphisms (SNPs) (Wang et al., Science, 280:1077-1082, 1998).

In still yet another aspect, the present invention provides hybrid genetic complements, as represented by broccoli plant cells, tissues, plants, and seeds, formed by the combination of a haploid genetic complement of a broccoli plant of the invention with a haploid genetic complement of a second broccoli plant, preferably, another, distinct broccoli plant. In another aspect, the present invention provides a broccoli plant regenerated from a tissue culture that comprises a hybrid genetic complement of this invention.

In still yet another aspect, the invention provides a method of determining the genotype of a plant of broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 comprising detecting in the genome of the plant at least a first polymorphism. The method may, in certain embodiments, comprise detecting a plurality of polymorphisms in the genome of the plant. The method may further comprise storing the results of the step of detecting the plurality of polymorphisms on a computer readable medium. The invention further provides a computer readable medium produced by such a method.

Any embodiment discussed herein with respect to one aspect of the invention applies to other aspects of the invention as well, unless specifically noted.

The term “about” is used to indicate that a value includes the standard deviation of the mean for the device or method being employed to determine the value. The use of the term “or” in the claims is used to mean “and/or” unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive. When used in conjunction with the word “comprising” or other open language in the claims, the words “a” and “an” denote “one or more,” unless specifically noted otherwise. The terms “comprise,” “have” and “include” are open-ended linking verbs. Any forms or tenses of one or more of these verbs, such as “comprises,” “comprising,” “has,” “having,” “includes” and “including,” are also open-ended. For example, any method that “comprises,” “has” or “includes” one or more steps is not limited to possessing only those one or more steps and also covers other unlisted steps. Similarly, any plant that “comprises,” “has” or “includes” one or more traits is not limited to possessing only those one or more traits and covers other unlisted traits.

Other objects, features and advantages of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and any specific examples provided, while indicating specific embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides methods and compositions relating to plants, seeds and derivatives of PX 05181808 broccoli hybrid PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128. The hybrid PX 05181808 was produced by the cross of parent lines BRM 51-1210 and BRL 51-1128. The parent lines show uniformity and stability within the limits of environmental influence. By crossing the parent lines, uniform plants of hybrid PX 05181808 can be obtained.

A. Origin and Breeding History of Broccoli Hybrid PX 05181808

The parents of hybrid PX 05181808 are BRM 51-1210 and BRL 51-1128, usually with BRM 51-1210 as a male parent. These parents were created as follows.

BRL 51-1128, which is disclosed in U.S. patent application Ser. No. 12/859,034, filed Aug. 18, 2010, was developed from an original cross of BRL 51-99 single cross (SC) with a cytoplasmic male sterile (CMS) Broccoli having the cabbage Blue Dynasty cytoplasm. BRL 51-99 was the doubled haploid inbred line 398-1254. A back cross program using BRL 51-99 as the recurrent pollen parent for 5 generations was pursued. After five generations of backcrossing, BRL 51-1128 CMS BC 5 line was sent to a production site and the breeder source 05BajaBK 76-2A/CP 1915 was created and used in foundation seed program for this inbred.

Line 146/293 was planted and observed for maturity, position of the crowns in relation to the leaves, and for early bud opening. This source also had elevated levels of MSP and lower MSB when compared with other broccoli parent lines(data available from VQL). The line was selected for these traits among others unique to this release and individuals were self pollinated. The S 1 generation was named BRM-51-1107 and selection number 4 appeared the most uniform for the selected phenotype for these traits. Progeny from BRM-51-1107-4 were grown out and observed to be uniform and true breeding for these characters. These seeds were used to produce a mass population which was produced with honey bees and this seed was bulked and used as the breeder source for BRM 51-1210.

B. Physiological and Morphological Characteristics of Broccoli Hybrid PX 05181808, Broccoli Line BRM 51-1210 and Broccoli Line BRL 51-1128

In accordance with one aspect of the present invention, there is provided a plant having the physiological and morphological characteristics of broccoli hybrid PX 05181808 and the parent lines thereof. A description of the physiological and morphological characteristics of such plants is presented in Tables 1-3.

TABLE 1 Physiological and Morphological Characteristics of Hybrid PX 05181808 Characteristic PX 05181808 Heritage A Region of Adaptation pacific coast pacific coast B Maturity, Spring Planted days from direct seeding to 133 133 50% harvest sowing date 7-Jan-10 27-Jan-10 50% harvest date 20-May-10 9-Jun-10 days from transplanting to 50%  91  91 harvest transplant date 18-Feb-10 10-Mar-10 length of harvest period in days  1  1 first harvest date 20-May-10 9-Jun-10 last harvest date 20-May-10 9-Jun-10 harvest season (main crop at winter/spring winter/spring 50% harvest) time of harvest maturity (50% medium (Sumosun) medium of plants) time of beginning of flowering medium** (Coaster, medium (50% of plants with at least Cruiser) 10% flowers) **choice for UPOV TG only C Seedling cotyledon color medium green purple green RHS color chart value for 136B N187A seedling cotyledon color cotyledon anthocyanin absent strong hypocotyl anthocyanin strong strong D Plant plant height in centimeters 47.96 cm 71.75 cm from soil line to top of leaves head height in centimeters from 31.1 cm 39.85 cm soil line to top of leaves height at harvest maturity medium very tall (Coaster) number of stems one (Ramoso Calabrese, one Shogun) branches few few habit intermediate intermediate market class both both life cycle annual annual type of variety first generation hybrid first generation hybrid E Leaves outer leaves: number of leaves  28.43  21.26 per plant (at harvest) outer leaves: width (at 12.6 cm 22.65 cm midpoint of plant including petiole) leaf: width narrow (Arcadia, broad Brigadeer) outer leaves: length (at 42.8 cm 63.7 cm midpoint of plant including petiole) leaf: length (including petiole) medium (Brigadeer, long Sumosun) outer leaves: petiole length 20.1 cm 20.95 cm petiole: length long long outer leaves: leaf ratio - 3:1 3:1 length/width outer leaves: leaf attachment petiolate petiolate outer leaves: wax presence strong intermediate leaf: number of lobes medium (Coaster, medium Topper) outer leaves: foliage color medium green dark green (with wax, if present) outer leaves: foliage color 139A 139A (with wax, if present; RHS color chart value) leaf blade: color green (Claudia, Verflor) green leaf blade: intensity of color medium medium leaf blade: anthocyanin present (Buccaneer, absent coloration Pascal) leaf blade: undulation of medium (Citation) medium margin leaf blade: dentation of margin medium (Buccaneer) weak outer leaves: leaf shape narrow elliptic narrow elliptic outer leaves: leaf base blunt blunt outer leaves: leaf apex blunt blunt outer leaves: leaf margins very wavy very wavy outer leaves: leaf veins intermediate intermediate outer leaves: midrib raised slightly raised leaf blade: blistering weak (Coaster, Gem) weak petiole: anthocyanin coloration absent (Claudia, absent of leaf petiole Embassy) outer leaves: attitude (leaf semi-erect (35-55 semi-erect angle from ground) degrees) leaf: attitude (at beginning of semi-erect (Arcadia, semi-erect head formation) Asti, Civet, Claudia) outer leaves: torsion of leaf tip weak weak outer leaves: profile of upper planar planar side of leaf F Head length of branching at base short (Brigadeer, short (excluding stem) Buccaneer Emperor) diameter at widest point (at 14.4 cm 12.2 cm market maturity) depth (at market maturity) 9.73 cm 7.46 cm weight, market trimmed (at 236.33 gm 206.8 gm market maturity) color medium green (Idol, blue green Verflor) intensity of color medium medium RHS color chart value for head N138A N138A color anthocyanin coloration absent (Early White absent Sprouting) shape (at market maturity) circular (Esquire) circular dome shape (at market semi-domed semi-domed maturity) size (at market maturity) for US medium** medium Exhibit C only **choice (Dundee, Early Man) compactness/firmness (at short pedicels/tight/ short pedicels/tight/ market maturity) firm (Captain) firm surface knobbling (at market fine (Apollo, Brigadeer) fine maturity) texture fine (Auriga, Bishop, fine Green Top) bead size (at market maturity) small small flower buds (at market even in size even in size maturity) anthocyanin coloration of leaf absent absent axils (at market maturity) anthocyanin coloration of leaf absent absent veins (at market maturity) anthocyanin coloration of leaf present absent blade (at market maturity) anthocyanin coloration of entire present absent plant (at market maturity) anthocyanin coloration of leaf absent absent petiole (at market maturity) color of head leaves (at market green green maturity) RHS color chart value for the N138B N138C color of head leaves bracts absent (Gem, Orion) absent secondary heads (at market basal completely absent maturity) prominence of secondary heads strong (Marathon, (at market maturity) Tribute) number of secondary heads (at  2.82  0 market maturity) G Flower Color **choice for UPOV TG yellow** (Brigadeer, yellow only Orion) intensity of yellow color light (Brigadeer) light color 2D 5C stalk color green green RHS color chart value for 137D 137B flower stalk color Male sterility present (Chevalier, present Montop) *These are typical values. Values may vary due to environment. Other values that are substantially equivalent are also within the scope of the invention.

TABLE 2 Physiological and Morphological Characteristics of Line BRM 51-1210 Characteristic BRM 51-1210 Heritage A Region of Adaptation pacific coast pacific coast B Maturity, Spring Planted days from direct seeding to 148 133 50% harvest sowing date 27-Jan-10 27-Jan-10 50% harvest date 24-Jun-10 9-Jun-10 days from transplanting to 50% 106  91 harvest transplant date 10-Mar-10 10-Mar-10 length of harvest period in days  1  1 first harvest date 24-Jun-10 9-Jun-10 last harvest date 24-Jun-10 9-Jun-10 harvest season (main crop at winter/spring winter/spring 50% harvest) time of harvest maturity (50% late (Colibri, Ginga, medium of plants) Pollux) time of beginning of flowering late** (Shogun, Viola) medium (50% of plants with at least 10% flowers) **choice for UPOV TG only C Seedling cotyledon color medium green purple-green RHS color chart value for 138A N187A seedling cotyledon color cotyledon anthocyanin absent strong hypocotyl anthocyanin weak strong D Plant plant height in centimeters 30.8 cm 47.93 cm from soil line to top of leaves head height in centimeters from 24.46 cm 29.86 cm soil line to top of leaves height at harvest maturity short (Packman, Primor) medium number of stems one one (Ramoso Calabrese, Shogun) branches few few habit compact intermediate market class both both life cycle annual annual type of variety inbred first generation hybrid E Leaves outer leaves: number of leaves  22.13  21.26 per plant (at harvest) outer leaves: width (at 8.53 cm 12 cm midpoint of plant including petiole) leaf: width narrow (Arcadia, narrow Brigadeer) outer leaves: length (at 26.46 cm 34.86 cm midpoint of plant including petiole) leaf: length (including petiole) short (Dandy Early, medium Emperor) outer leaves: petiole length 10 cm 12.6 cm petiole: length medium (Emperor, medium Ramoso Calabrese) outer leaves: leaf ratio - 3:1 3:1 length/width outer leaves: leaf attachment petiolate petiolate outer leaves: wax presence strong intermediate leaf: number of lobes medium (Coaster, medium Topper) outer leaves: foliage color blue green dark green (with wax, if present) outer leaves: foliage color N138D 139A (with wax, if present; RHS color chart value) leaf blade: color blue green (Citation, green Esquire, Symphony) leaf blade: intensity of color medium medium leaf blade: anthocyanin present (Buccaneer, absent coloration Pascal) leaf blade: undulation of medium (Citation) medium margin leaf blade: dentation of margin medium (Buccaneer) weak outer leaves: leaf shape narrow elliptic narrow elliptic outer leaves: leaf base blunt blunt outer leaves: leaf apex blunt blunt outer leaves: leaf margins slightly wavy very wavy outer leaves: leaf veins thick intermediate outer leaves: midrib raised slightly raised leaf blade: blistering absent or very weak weak (Buccaneer, Colibri) petiole: anthocyanin coloration of absent (Claudia, absent leaf petiole Embassy) outer leaves: attitude (leaf erect (80-100 degrees) semi-erect angle from ground) leaf: attitude (at beginning of semi-erect (Arcadia, semi-erect head formation) Asti, Civet, Claudia) outer leaves: torsion of leaf tip none weak outer leaves: profile of upper planar planar side of leaf F Head length of branching at base long (Laser, Kayak) short (excluding stem) diameter at widest point (at 10.53 cm 12.2 cm market maturity) depth (at market maturity) 9.13 cm 7.46 cm weight, market trimmed (at 105.26 gm 206.8 gm market maturity) color light green blue green intensity of color light medium RHS color chart value for head N138C N138A color anthocyanin coloration absent (Early White absent Sprouting) shape (at market maturity) transverse elliptic circular narrow (Citation, Scorpio, Zeus) dome shape (at market domed semi-domed maturity) size (at market maturity) for US small** (Orbit, Scorpio) medium Exhibit C only **choice compactness/firmness (at long pedicels/loose short pedicels/tight/ market maturity) (Caravel) firm surface knobbling (at market coarse (Perseus, Regilio) fine maturity) texture coarse (Citation) fine bead size (at market maturity) small small flower buds (at market uneven in size (cateye) even in size maturity) anthocyanin coloration of leaf absent absent axils (at market maturity) anthocyanin coloration of leaf absent absent veins (at market maturity) anthocyanin coloration of leaf present absent blade (at market maturity) anthocyanin coloration of entire present absent plant (at market maturity) anthocyanin coloration of leaf absent absent petiole (at market maturity) color of head leaves (at market green green maturity) RHS color chart value for the N138C N138C color of head leaves bracts absent (Gem, Orion) absent secondary heads (at market combination completely absent maturity) prominence of secondary heads strong (Marathon, (at market maturity) Tribute) number of secondary heads (at  3.2  0 market maturity) G Flower Color **choice for UPOV TG cream yellow only color 157D 5C stalk color green green RHS color chart value for 138A 137B flower stalk color male sterility absent (Marathon) present *These are typical values. Values may vary due to environment. Other values that are substantially equivalent are also within the scope of the invention.

TABLE 3 Physiological and Morphological Characteristics of Line BRL 51-1128 CHARACTERISTIC BRL 51-1128 Heritage Region of Adaptation (area Pacific Coast Pacific Coast where best adapted in USA) Maturity, Spring Planted days from direct 138 133 seeding to 50% harvest sowing date 27-Jan-10 27-Jan-10 50% harvest date 14-Jun-10 9-Jun-10 days from  96  91 transplanting to 50% harvest transplant date 10-Mar-10 10-Mar-10 length of harvest period in  1  1 days first harvest date 14-Jun-10 9-Jun-10 last harvest date 14-Jun-10 9-Jun-10 Harvest Season (main Winter/Spring Winter/Spring crop at 50% harvest) Time of Harvest Maturity Late (Colibri, Medium (50% of plants) Ginga, Pollux) Time of Beginning of Late Medium Flowering (50% of plants (Shogun, Viola) with at least 10% flowers) Seedling Cotyledon Color light green purple-green Cotyledon Color (RHS 136C N187A color chart value) Cotyledon Anthocyanin absent strong Hypocotyl Anthocyanin strong strong Plant Plant Height (at harvest,  42.53  47.93 cm) Head Height (at harvest,  23.13  29.86 cm) Height (at harvest Short medium maturity) (Packman, Primor) Number of Stems one (Ramoso one Calabrese, Shogun) Branches few few Habit compact Intermediate Market Class Both Both Life Cycle Annual Annual Type of Variety Inbred First generation hybrid Leaf Width narrow (Arcadia, narow Brigadeer) Length (including petiole) Medium (Brigadeer, medium Sumosun) Number of Lobes medium (Coaster, medium Topper) Attitude (at beginning of Semi-erect Semi Erect head formation) (Arcadia, Asti, Civet, Claudia) Outer Leaves Number of Leaves Per  17.2  21.26 Plant (at harvest) Width (at midpoint of  11.46  12 plant including petiole, cm) Length (at midpoint of  35.2  34.86 plant including petiole, cm) Petiole Length (cm)  13.73  12.6 Leaf Ratio - 3:1 3:1 Length/Width Leaf Attachment Petiolate Petiolate Wax Presence strong intermediate Foliage Color (with wax, blue-green Dark Green if present) Foliage Color (with wax, N138A 139A if present, RHS color chart value) Leaf Shape Narrow elliptic Narrow Elliptic Leaf Base Blunt Blunt Leaf Apex Blunt Blunt Leaf Margins Very Wavy Very Wavy Leaf Veins intermediate intermediate Midrib Raised Slightly Raised Attitude (leaf angle from Erect Semi-Erect ground) (80-100 degrees) Torsion of Leaf Tip none weak Profile of Upper Side of planar Planar Leaf Petiole anthocyanin coloration of absent (Claudia, absent leaf petiole Embassy) Length medium (Emperor, medium Ramoso Calabrese) Leaf Blade Color blue green (Citation, Green Esquire, Symphony) Intensity of Color medium medium Anthocyanin Coloration absent (Claudia, Absent Embassy) Undulation of Margin weak (Beaufort, Medium Early Pack, Laser, Paladin) Dentation of Margin weak (Galaxy) weak Blistering absent or very weak weak (Buccaneer, Colibri) Head Length of Branching at short (Brigadeer, Short Base (excluding stem) Buccaneer, Emperor) Diameter (at widest point,  14.2  12.2 at market maturity, cm) Depth (at market  7.46  7.4 maturity, cm) Weight (market trimmed, 230.2 206.8 at market maturity, grams) Color (at market maturity) medium green Blue-Green (Idol, Verflor) Intensity of Color Medium medium Color (at market maturity, N138A N138A RHS color chart value) Anthocyanin Coloration absent (Early White Absent Sprouting) Shape (at market circular (Esquire) circular maturity) Dome Shape (at market Domed Semi-Domed maturity) Size (at market maturity) medium (Dundee, Medium Early Man) Compactness/Firmness (at Short Pedicels/ Short Pedicels/ market maturity) Tight/Firm (Captain) Tight/Firm Surface Knobbling (at fine (Apollo, Fine market maturity) Brigadeer) Texture very fine (Viola) Fine Bead Size (at market Small Small maturity) Flower Buds (at market even in size Even In Size maturity) Anthocyanin Coloration absent Absent of Leaf Axils (at market maturity) Anthocyanin Coloration Absent Absent of Leaf Veins (at market maturity) Anthocyanin Coloration Present Absent of Leaf Blade (at market maturity) Anthocyanin Coloration Present absent of Entire Plant (at market maturity) Anthocyanin Coloration Absent Absent of Leaf Petiole (at market maturity) Color of Head Leaves (at Green Green market maturity) Color of Head Leaves (at N138A N138C market maturity, RHS color chart value) Bracts absent (Gem, Orion) Absent Secondary Heads (at completely absent completely market maturity) (Scorpio, Zeus) absent Number of Secondary 0 0 Heads (at market maturity) Flower Color cream Yellow Color (RHS color chart 1D 5C value) Stalk Color (RHS color 143A 137B chart value) Male Sterility Present Present (Chevalier, Montop) *These are typical values. Values may vary due to environment. Other values that are substantially equivalent are also within the scope of the invention.

C. Breeding Broccoli Plants

One aspect of the current invention concerns methods for producing seed of broccoli hybrid PX 05181808 involving crossing broccoli lines BRM 51-1210 and BRL 51-1128. Alternatively, in other embodiments of the invention, hybrid PX 05181808, line BRM 51-1210, or line BRL 51-1128 may be crossed with itself or with any second plant. Such methods can be used for propagation of hybrid PX 05181808 and/or the broccoli lines BRM 51-1210 and BRL 51-1128, or can be used to produce plants that are derived from hybrid PX 05181808 and/or the broccoli lines BRM 51-1210 and BRL 51-1128. Plants derived from hybrid PX 05181808 and/or the broccoli lines BRM 51-1210 and BRL 51-1128 may be used, in certain embodiments, for the development of new broccoli varieties.

The development of new varieties using one or more starting varieties is well known in the art. In accordance with the invention, novel varieties may be created by crossing hybrid PX 05181808 followed by multiple generations of breeding according to such well known methods. New varieties may be created by crossing with any second plant. In selecting such a second plant to cross for the purpose of developing novel lines, it may be desired to choose those plants which either themselves exhibit one or more selected desirable characteristics or which exhibit the desired characteristic(s) when in hybrid combination. Once initial crosses have been made, inbreeding and selection take place to produce new varieties. For development of a uniform line, often five or more generations of selfing and selection are involved.

Uniform lines of new varieties may also be developed by way of double-haploids. This technique allows the creation of true breeding lines without the need for multiple generations of selfing and selection. In this manner true breeding lines can be produced in as little as one generation. Haploid embryos may be produced from microspores, pollen, anther cultures, or ovary cultures. The haploid embryos may then be doubled autonomously, or by chemical treatments (e.g. colchicine treatment). Alternatively, haploid embryos may be grown into haploid plants and treated to induce chromosome doubling. In either case, fertile homozygous plants are obtained. In accordance with the invention, any of such techniques may be used in connection with a plant of the invention and progeny thereof to achieve a homozygous line.

Backcrossing can also be used to improve an inbred plant. Backcrossing transfers a specific desirable trait from one inbred or non-inbred source to an inbred that lacks that trait. This can be accomplished, for example, by first crossing a superior inbred (A) (recurrent parent) to a donor inbred (non-recurrent parent), which carries the appropriate locus or loci for the trait in question. The progeny of this cross are then mated back to the superior recurrent parent (A) followed by selection in the resultant progeny for the desired trait to be transferred from the non-recurrent parent. After five or more backcross generations with selection for the desired trait, the progeny have the characteristic being transferred, but are like the superior parent for most or almost all other loci. The last backcross generation would be selfed to give pure breeding progeny for the trait being transferred.

The plants of the present invention are particularly well suited for the development of new lines based on the elite nature of the genetic background of the plants. In selecting a second plant to cross with PX 05181808 and/or broccoli lines BRM 51-1210 and BRL 51-1128 for the purpose of developing novel broccoli lines, it will typically be preferred to choose those plants which either themselves exhibit one or more selected desirable characteristics or which exhibit the desired characteristic(s) when in hybrid combination. Examples of desirable traits may include, in specific embodiments, high seed yield, high seed germination, seedling vigor, high yield, disease tolerance or resistance, and adaptability for soil and climate conditions. Consumer-driven traits, such as a head shape, nutritional value, and taste are other examples of traits that may be incorporated into new lines of broccoli plants developed by this invention.

D. Performance Characteristics

As described above, hybrid PX 05181808 exhibits desirable agronomic traits. The performance characteristics of hybrid PX 05181808 were the subject of an objective analysis of the performance traits relative to other varieties. The results of the analysis are presented below.

TABLE 4 Analysis of MSB Content of PX 05181808 Varieties Least-Squares Means for MSB (micromoles/gm/FW) PX05181808 3.3866590 Heritage 1.6311887

TABLE 5 Performance Characteristics For BRL 51-1128 Glucoraphanin (MSB) Glucoiberin (MSP) micromoles/gram micromoles/gram Variety fresh weight fresh weight BRL 51-1128 1.026 0.000* BRL 51-1128 1.256 0.000* BRL 51-1128 1.420 0.168 *no measurable glucoiberin (MSP)

E. Further Embodiments of the Invention

In certain aspects of the invention, plants described herein are provided modified to include at least a first desired heritable trait. Such plants may, in one embodiment, be developed by a plant breeding technique called backcrossing, wherein essentially all of the morphological and physiological characteristics of a variety are recovered in addition to a genetic locus transferred into the plant via the backcrossing technique. The term single locus converted plant as used herein refers to those broccoli plants which are developed by a plant breeding technique called backcrossing, wherein essentially all of the morphological and physiological characteristics of a variety are recovered in addition to the single locus transferred into the variety via the backcrossing technique. By essentially all of the morphological and physiological characteristics, it is meant that the characteristics of a plant are recovered that are otherwise present when compared in the same environment, other than an occasional variant trait that might arise during backcrossing or direct introduction of a transgene.

Backcrossing methods can be used with the present invention to improve or introduce a characteristic into the present variety. The parental broccoli plant which contributes the locus for the desired characteristic is termed the nonrecurrent or donor parent. This terminology refers to the fact that the nonrecurrent parent is used one time in the backcross protocol and therefore does not recur. The parental broccoli plant to which the locus or loci from the nonrecurrent parent are transferred is known as the recurrent parent as it is used for several rounds in the backcrossing protocol.

In a typical backcross protocol, the original variety of interest (recurrent parent) is crossed to a second variety (nonrecurrent parent) that carries the single locus of interest to be transferred. The resulting progeny from this cross are then crossed again to the recurrent parent and the process is repeated until a broccoli plant is obtained wherein essentially all of the morphological and physiological characteristics of the recurrent parent are recovered in the converted plant, in addition to the single transferred locus from the nonrecurrent parent.

The selection of a suitable recurrent parent is an important step for a successful backcrossing procedure. The goal of a backcross protocol is to alter or substitute a single trait or characteristic in the original variety. To accomplish this, a single locus of the recurrent variety is modified or substituted with the desired locus from the nonrecurrent parent, while retaining essentially all of the rest of the desired genetic, and therefore the desired physiological and morphological constitution of the original variety. The choice of the particular nonrecurrent parent will depend on the purpose of the backcross; one of the major purposes is to add some commercially desirable trait to the plant. The exact backcrossing protocol will depend on the characteristic or trait being altered and the genetic distance between the recurrent and nonrecurrent parents. Although backcrossing methods are simplified when the characteristic being transferred is a dominant allele, a recessive allele, or an additive allele (between recessive and dominant), may also be transferred. In this instance it may be necessary to introduce a test of the progeny to determine if the desired characteristic has been successfully transferred.

In one embodiment, progeny broccoli plants of a backcross in which a plant described herein is the recurrent parent comprise (i) the desired trait from the non-recurrent parent and (ii) all of the physiological and morphological characteristics of the recurrent parent as determined at the 5% significance level when grown in the same environmental conditions.

New varieties can also be developed from more than two parents. The technique, known as modified backcrossing, uses different recurrent parents during the backcrossing. Modified backcrossing may be used to replace the original recurrent parent with a variety having certain more desirable characteristics or multiple parents may be used to obtain different desirable characteristics from each.

With the development of molecular markers associated with particular traits, it is possible to add additional traits into an established germ line, such as represented here, with the end result being substantially the same base germplasm with the addition of a new trait or traits. Molecular breeding, as described in Moose and Mumm, 2008 (Plant Physiology, 147: 969-977), for example, and elsewhere, provides a mechanism for integrating single or multiple traits or QTL into an elite line. This molecular breeding-facilitated movement of a trait or traits into an elite line may encompass incorporation of a particular genomic fragment associated with a particular trait of interest into the elite line by the mechanism of identification of the integrated genomic fragment with the use of flanking or associated marker assays. In the embodiment represented here, one, two, three or four genomic loci, for example, may be integrated into an elite line via this methodology. When this elite line containing the additional loci is further crossed with another parental elite line to produce hybrid offspring, it is possible to then incorporate at least eight separate additional loci into the hybrid. These additional loci may confer, for example, such traits as a disease resistance or a fruit quality trait. In one embodiment, each locus may confer a separate trait. In another embodiment, loci may need to be homozygous and exist in each parent line to confer a trait in the hybrid. In yet another embodiment, multiple loci may be combined to confer a single robust phenotype of a desired trait.

Many single locus traits have been identified that are not regularly selected for in the development of a new inbred but that can be improved by backcrossing techniques. Single locus traits may or may not be transgenic; examples of these traits include, but are not limited to, herbicide resistance, resistance to bacterial, fungal, or viral disease, insect resistance, modified fatty acid or carbohydrate metabolism, and altered nutritional quality. These comprise genes generally inherited through the nucleus.

Direct selection may be applied where the single locus acts as a dominant trait. For this selection process, the progeny of the initial cross are assayed for viral resistance and/or the presence of the corresponding gene prior to the backcrossing. Selection eliminates any plants that do not have the desired gene and resistance trait, and only those plants that have the trait are used in the subsequent backcross. This process is then repeated for all additional backcross generations.

Selection of broccoli plants for breeding is not necessarily dependent on the phenotype of a plant and instead can be based on genetic investigations. For example, one can utilize a suitable genetic marker which is closely genetically linked to a trait of interest. One of these markers can be used to identify the presence or absence of a trait in the offspring of a particular cross, and can be used in selection of progeny for continued breeding. This technique is commonly referred to as marker assisted selection. Any other type of genetic marker or other assay which is able to identify the relative presence or absence of a trait of interest in a plant can also be useful for breeding purposes. Procedures for marker assisted selection are well known in the art. Such methods will be of particular utility in the case of recessive traits and variable phenotypes, or where conventional assays may be more expensive, time consuming or otherwise disadvantageous. Types of genetic markers which could be used in accordance with the invention include, but are not necessarily limited to, Simple Sequence Length Polymorphisms (SSLPs) (Williams et al., Nucleic Acids Res., 1 8:6531-6535, 1990), Randomly Amplified Polymorphic DNAs (RAPDs), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Arbitrary Primed Polymerase Chain Reaction (AP-PCR), Amplified Fragment Length Polymorphisms (AFLPs) (EP 534 858, specifically incorporated herein by reference in its entirety), and Single Nucleotide Polymorphisms (SNPs) (Wang et al., Science, 280:1077-1082, 1998).

F. Plants Derived by Genetic Engineering

Many useful traits that can be introduced by backcrossing, as well as directly into a plant, are those which are introduced by genetic transformation techniques. Genetic transformation may therefore be used to insert a selected transgene into a plant of the invention or may, alternatively, be used for the preparation of transgenes which can be introduced by backcrossing. Methods for the transformation of plants that are well known to those of skill in the art and applicable to many crop species include, but are not limited to, electroporation, microprojectile bombardment, Agrobacterium-mediated transformation and direct DNA uptake by protoplasts.

To effect transformation by electroporation, one may employ either friable tissues, such as a suspension culture of cells or embryogenic callus or alternatively one may transform immature embryos or other organized tissue directly. In this technique, one would partially degrade the cell walls of the chosen cells by exposing them to pectin-degrading enzymes (pectolyases) or mechanically wound tissues in a controlled manner.

An efficient method for delivering transforming DNA segments to plant cells is microprojectile bombardment. In this method, particles are coated with nucleic acids and delivered into cells by a propelling force. Exemplary particles include those comprised of tungsten, platinum, and preferably, gold. For the bombardment, cells in suspension are concentrated on filters or solid culture medium. Alternatively, immature embryos or other target cells may be arranged on solid culture medium. The cells to be bombarded are positioned at an appropriate distance below the macroprojectile stopping plate.

An illustrative embodiment of a method for delivering DNA into plant cells by acceleration is the Biolistics Particle Delivery System, which can be used to propel particles coated with DNA or cells through a screen, such as a stainless steel or Nytex screen, onto a surface covered with target cells. The screen disperses the particles so that they are not delivered to the recipient cells in large aggregates. Microprojectile bombardment techniques are widely applicable, and may be used to transform virtually any plant species.

Agrobacterium-mediated transfer is another widely applicable system for introducing gene loci into plant cells. An advantage of the technique is that DNA can be introduced into whole plant tissues, thereby bypassing the need for regeneration of an intact plant from a protoplast. Modern Agrobacterium transformation vectors are capable of replication in E. coli as well as Agrobacterium, allowing for convenient manipulations (Klee et al., Bio-Technology, 3(7):637-642, 1985). Moreover, recent technological advances in vectors for Agrobacterium-mediated gene transfer have improved the arrangement of genes and restriction sites in the vectors to facilitate the construction of vectors capable of expressing various polypeptide coding genes. The vectors described have convenient multi-linker regions flanked by a promoter and a polyadenylation site for direct expression of inserted polypeptide coding genes. Additionally, Agrobacterium containing both armed and disarmed Ti genes can be used for transformation.

In those plant strains where Agrobacterium-mediated transformation is efficient, it is the method of choice because of the facile and defined nature of the gene locus transfer. The use of Agrobacterium-mediated plant integrating vectors to introduce DNA into plant cells is well known in the art (Fraley et al., Bio/Technology, 3:629-635, 1985; U.S. Pat. No. 5,563,055).

Transformation of plant protoplasts also can be achieved using methods based on calcium phosphate precipitation, polyethylene glycol treatment, electroporation, and combinations of these treatments (see, e.g., Potrykus et al., Mol. Gen. Genet., 199:183-188, 1985; Omirulleh et al., Plant Mol. Biol., 21(3):415-428, 1993; Fromm et al., Nature, 312:791-793, 1986; Uchimiya et al., Mol. Gen. Genet., 204:204, 1986; Marcotte et al., Nature, 335:454, 1988). Transformation of plants and expression of foreign genetic elements is exemplified in Choi et al. (Plant Cell Rep., 13: 344-348, 1994), and Ellul et al. (Theor. Appl. Genet., 107:462-469, 2003).

A number of promoters have utility for plant gene expression for any gene of interest including but not limited to selectable markers, scoreable markers, genes for pest tolerance, disease resistance, nutritional enhancements and any other gene of agronomic interest. Examples of constitutive promoters useful for plant gene expression include, but are not limited to, the cauliflower mosaic virus (CaMV) P-35S promoter, which confers constitutive, high-level expression in most plant tissues (see, e.g., Odel et al., Nature, 313:810, 1985), including in monocots (see, e.g., Dekeyser et al., Plant Cell, 2:591, 1990; Terada and Shimamoto, Mol. Gen. Genet., 220:389, 1990); a tandemly duplicated version of the CaMV 35S promoter, the enhanced 35S promoter (P-e35S) the nopaline synthase promoter (An et al., Plant Physiol., 88:547, 1988), the octopine synthase promoter (Fromm et al., Plant Cell, 1:977, 1989); and the figwort mosaic virus (P-FMV) promoter as described in U.S. Pat. No. 5,378,619 and an enhanced version of the FMV promoter (P-eFMV) where the promoter sequence of P-FMV is duplicated in tandem, the cauliflower mosaic virus 19S promoter, a sugarcane bacilliform virus promoter, a commelina yellow mottle virus promoter, and other plant DNA virus promoters known to express in plant cells.

A variety of plant gene promoters that are regulated in response to environmental, hormonal, chemical, and/or developmental signals can also be used for expression of an operably linked gene in plant cells, including promoters regulated by (1) heat (Callis et al., Plant Physiol., 88:965, 1988), (2) light (e.g., pea rbcS-3A promoter, Kuhlemeier et al., Plant Cell, 1:471, 1989; maize rbcS promoter, Schaffner and Sheen, Plant Cell, 3:997, 1991; or chlorophyll a/b-binding protein promoter, Simpson et al., EMBO J., 4:2723, 1985), (3) hormones, such as abscisic acid (Marcotte et al., Plant Cell, 1:969, 1989), (4) wounding (e.g., wunl, Siebertz et al., Plant Cell, 1:961, 1989); or (5) chemicals such as methyl jasmonate, salicylic acid, or Safener. It may also be advantageous to employ organ-specific promoters (e.g., Roshal et al., EMBO J., 6:1155, 1987; Schernthaner et al., EMBO J., 7:1249, 1988; Bustos et al., Plant Cell, 1:839, 1989).

Exemplary nucleic acids which may be introduced to plants of this invention include, for example, DNA sequences or genes from another species, or even genes or sequences which originate with or are present in the same species, but are incorporated into recipient cells by genetic engineering methods rather than classical reproduction or breeding techniques. However, the term “exogenous” is also intended to refer to genes that are not normally present in the cell being transformed, or perhaps simply not present in the form, structure, etc., as found in the transforming DNA segment or gene, or genes which are normally present and that one desires to express in a manner that differs from the natural expression pattern, e.g., to over-express. Thus, the term “exogenous” gene or DNA is intended to refer to any gene or DNA segment that is introduced into a recipient cell, regardless of whether a similar gene may already be present in such a cell. The type of DNA included in the exogenous DNA can include DNA which is already present in the plant cell, DNA from another plant, DNA from a different organism, or a DNA generated externally, such as a DNA sequence containing an antisense message of a gene, or a DNA sequence encoding a synthetic or modified version of a gene.

Many hundreds if not thousands of different genes are known and could potentially be introduced into a broccoli plant according to the invention. Non-limiting examples of particular genes and corresponding phenotypes one may choose to introduce into a broccoli plant include one or more genes for insect tolerance, such as a Bacillus thuringiensis (B.t.) gene, pest tolerance such as genes for fungal disease control, herbicide tolerance such as genes conferring glyphosate tolerance, and genes for quality improvements such as yield, nutritional enhancements, environmental or stress tolerances, or any desirable changes in plant physiology, growth, development, morphology or plant product(s). For example, structural genes would include any gene that confers insect tolerance including but not limited to a Bacillus insect control protein gene as described in WO 99/31248, herein incorporated by reference in its entirety, U.S. Pat. No. 5,689,052, herein incorporated by reference in its entirety, U.S. Pat. Nos. 5,500,365 and 5,880,275, herein incorporated by reference in their entirety. In another embodiment, the structural gene can confer tolerance to the herbicide glyphosate as conferred by genes including, but not limited to Agrobacterium strain CP4 glyphosate resistant EPSPS gene (aroA:CP4) as described in U.S. Pat. No. 5,633,435, herein incorporated by reference in its entirety, or glyphosate oxidoreductase gene (GOX) as described in U.S. Pat. No. 5,463,175, herein incorporated by reference in its entirety.

Alternatively, the DNA coding sequences can affect these phenotypes by encoding a non-translatable RNA molecule that causes the targeted inhibition of expression of an endogenous gene, for example via antisense- or cosuppression-mediated mechanisms (see, for example, Bird et al., Biotech. Gen. Engin. Rev., 9:207, 1991). The RNA could also be a catalytic RNA molecule (i.e., a ribozyme) engineered to cleave a desired endogenous mRNA product (see for example, Gibson and Shillito, Mol. Biotech., 7:125,1997). Thus, any gene which produces a protein or mRNA which expresses a phenotype or morphology change of interest is useful for the practice of the present invention.

G. Definitions

In the description and tables herein, a number of terms are used. In order to provide a clear and consistent understanding of the specification and claims, the following definitions are provided:

Allele: Any of one or more alternative forms of a gene locus, all of which alleles relate to one trait or characteristic. In a diploid cell or organism, the two alleles of a given gene occupy corresponding loci on a pair of homologous chromosomes.

Backcrossing: A process in which a breeder repeatedly crosses hybrid progeny, for example a first generation hybrid (F₁), back to one of the parents of the hybrid progeny. Backcrossing can be used to introduce one or more single locus conversions from one genetic background into another.

Crossing: The mating of two parent plants.

Cross-pollination: Fertilization by the union of two gametes from different plants.

Diploid: A cell or organism having two sets of chromosomes.

Emasculate: The removal of plant male sex organs or the inactivation of the organs with a cytoplasmic or nuclear genetic factor or a chemical agent conferring male sterility.

Enzymes: Molecules which can act as catalysts in biological reactions.

F₁ Hybrid: The first generation progeny of the cross of two nonisogenic plants.

Genotype: The genetic constitution of a cell or organism.

Haploid: A cell or organism having one set of the two sets of chromosomes in a diploid.

Linkage: A phenomenon wherein alleles on the same chromosome tend to segregate together more often than expected by chance if their transmission was independent.

Marker: A readily detectable phenotype, preferably inherited in codominant fashion (both alleles at a locus in a diploid heterozygote are readily detectable), with no environmental variance component, i.e., heritability of 1.

Phenotype: The detectable characteristics of a cell or organism, which characteristics are the manifestation of gene expression.

Quantitative Trait Loci (QTL): Quantitative trait loci (QTL) refer to genetic loci that control to some degree numerically representable traits that are usually continuously distributed.

Resistance: As used herein, the terms “resistance” and “tolerance” are used interchangeably to describe plants that show no symptoms to a specified biotic pest, pathogen, abiotic influence or environmental condition. These terms are also used to describe plants showing some symptoms but that are still able to produce marketable product with an acceptable yield. Some plants that are referred to as resistant or tolerant are only so in the sense that they may still produce a crop, even though the plants are stunted and the yield is reduced.

Regeneration: The development of a plant from tissue culture.

Royal Horticultural Society (RHS) color chart value: The RHS color chart is a standardized reference which allows accurate identification of any color. A color's designation on the chart describes its hue, brightness and saturation. A color is precisely named by the RHS color chart by identifying the group name, sheet number and letter, e.g., Yellow-Orange Group 19A or Red Group 41B.

Self-pollination: The transfer of pollen from the anther to the stigma of the same plant.

Single Locus Converted (Conversion) Plant: Plants which are developed by a plant breeding technique called backcrossing, wherein essentially all of the desired morphological and physiological characteristics of a broccoli variety are recovered in addition to the characteristics of the single locus transferred into the variety via the backcrossing technique and/or by genetic transformation.

Substantially Equivalent: A characteristic that, when compared, does not show a statistically significant difference (e.g., p=0.05) from the mean.

Tissue Culture: A composition comprising isolated cells of the same or a different type or a collection of such cells organized into parts of a plant.

Transgene: A genetic locus comprising a sequence which has been introduced into the genome of a broccoli plant by transformation.

H. Deposit Information

A deposit of broccoli hybrid PX 05181808 and lines BRM 51-1210 and BRL 51-1128, disclosed above and recited in the claims, has been made with the American Type Culture Collection (ATCC), 10801 University Blvd., Manassas, Va. 20110-2209. The dates of the deposits made were Apr. 13, 2011, May 4, 2011, and Dec. 23, 2008, respectively. The accession numbers for those deposited seeds of broccoli hybrid PX 05181808 and inbred parent lines BRM 51-1210 and BRL 51-1128 are ATCC Accession Number PTA-11824, ATCC Accession Number PTA-11868, and ATCC Accession Number PTA-9674, respectively. Upon issuance of a patent, all restrictions upon the deposits will be removed, and the deposits are intended to meet all of the requirements of 37 C.F.R. §1.801-1.809. The deposits will be maintained in the depository for a period of 30 years, or 5 years after the last request, or for the effective life of the patent, whichever is longer, and will be replaced if necessary during that period.

Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity and understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the invention, as limited only by the scope of the appended claims.

All references cited herein are hereby expressly incorporated herein by reference. 

1. A broccoli plant comprising at least a first set of the chromosomes of broccoli line BRM 51-1210, a sample of seed of said line having been deposited under ATCC Accession Number PTA-11868.
 2. A seed comprising at least a first set of the chromosomes of broccoli line BRM 51-1210, a sample of seed of said line having been deposited under ATCC Accession Number PTA-11868.
 3. The plant of claim 1, which is inbred.
 4. The plant of claim 1, which is hybrid.
 5. The seed of claim 2, which is inbred.
 6. The seed of claim 2, which is hybrid.
 7. The plant of claim 4, wherein the hybrid plant is broccoli hybrid PX 05181808, a sample of seed of said hybrid PX 05181808 having been deposited under ATCC Accession Number PTA-11824.
 8. The seed of claim 6, defined as a seed of broccoli hybrid PX 05181808, a sample of seed of said hybrid PX 05181808 having been deposited under ATCC Accession Number PTA-11824.
 9. The seed of claim 2, defined as a seed of line BRM 51-1210.
 10. A plant part of the plant of claim
 1. 11. The plant part of claim 10, further defined as a leaf, an ovule, a floret, pollen, a head, or a cell.
 12. A broccoli plant having all the physiological and morphological characteristics of the broccoli plant of claim
 7. 13. A tissue culture of regenerable cells of the plant of claim
 1. 14. The tissue culture according to claim 13, comprising cells or protoplasts from a plant part selected from the group consisting of embryos, meristems, cotyledons, pollen, leaves, anthers, roots, root tips, pistil, flower, seed and stalks.
 15. A broccoli plant regenerated from the tissue culture of claim
 13. 16. A method of vegetatively propagating the plant of claim 1 comprising the steps of: (a) collecting tissue capable of being propagated from a plant according to claim 1; (b) cultivating said tissue to obtain proliferated shoots; and (c) rooting said proliferated shoots to obtain rooted plantlets.
 17. The method of claim 16, further comprising growing at least a first plant from said rooted plantlets.
 18. A method of introducing a desired trait into a broccoli line comprising: (a) crossing a plant of line BRM 51-1210 with a second broccoli plant that comprises a desired trait to produce F1 progeny, a sample of seed of said line having been deposited under ATCC Accession Number PTA-11868; (b) selecting an F1 progeny that comprises the desired trait; (c) backcrossing the selected F1 progeny with a plant of line BRM 51-1210 to produce backcross progeny; (d) selecting backcross progeny comprising the desired trait and the physiological and morphological characteristic of broccoli line BRM 51-1210; and (e) repeating steps (c) and (d) three or more times to produce selected fourth or higher backcross progeny that comprise the desired trait.
 19. A broccoli plant produced by the method of claim
 18. 20. A method of producing a plant comprising an added trait, the method comprising introducing a transgene conferring the trait into a plant of hybrid PX 05181808, or line BRM 51-1210, a sample of seed of said hybrid and line having been deposited under ATCC Accession Number PTA-11824, and ATCC Accession Number PTA-11868, respectively.
 21. A plant produced by the method of claim
 20. 22. The plant of claim 1, comprising a transgene.
 23. The plant of claim 22, wherein the transgene confers a trait selected from the group consisting of male sterility, herbicide tolerance, insect resistance, pest resistance, disease resistance, modified fatty acid metabolism, environmental stress tolerance, modified carbohydrate metabolism and modified protein metabolism.
 24. The plant of claim 1, comprising a single locus conversion.
 25. The plant of claim 24, wherein the single locus conversion confers a trait selected from the group consisting of male sterility, herbicide tolerance, insect resistance, pest resistance, disease resistance, modified fatty acid metabolism, environmental stress tolerance, modified carbohydrate metabolism and modified protein metabolism.
 26. A method for producing a seed of a plant derived from at least one of hybrid PX 05181808, or line BRM 51-1210 comprising the steps of: (a) crossing a broccoli plant of hybrid PX 05181808, or line BRM 51-1210 with itself or a second broccoli plant; a sample of seed of said hybrid and line having been deposited under ATCC Accession Number PTA-11824, and ATCC Accession Number PTA-11868, respectively; and (b) allowing seed of a hybrid PX 05181808, or line BRM 51-1210-derived broccoli plant to form.
 27. The method of claim 26, further comprising the steps of: (c) selfing a plant grown from said hybrid PX 05181808, or BRM 51-1210-derived broccoli seed to yield additional hybrid PX 05181808, or line BRM 51-1210-derived broccoli seed; (d) growing said additional hybrid PX 05181808, or line BRM 51-1210-derived broccoli seed of step (c) to yield additional hybrid PX 05181808, or line BRM 51-1210-derived broccoli plants; and (e) repeating the crossing and growing steps of (c) and (d) to generate at least a first further hybrid PX 05181808, or line BRM 51-1210-derived broccoli plant.
 28. The method of claim 26, wherein the second broccoli plant is of an inbred broccoli line.
 29. The method of claim 26, comprising crossing line BRM 51-1210 with line BRL 51-1128, a sample of seed of said lines having been deposited under ATCC Accession Number PTA-11868, and ATCC Accession Number PTA-9674, respectively.
 30. The method of claim 27, further comprising: (f) crossing the further hybrid PX 05181808, or BRM 51-1210-derived broccoli plant with a second broccoli plant to produce seed of a hybrid progeny plant.
 31. A plant part of the plant of claim
 7. 32. The plant part of claim 31, further defined as a leaf, an ovule, a floret, pollen, a head, or a cell.
 33. A method of producing a broccoli seed comprising crossing the plant of claim 1 with itself or a second broccoli plant and allowing seed to form.
 34. A method of producing a broccoli comprising: (a) obtaining a plant according to claim 1, wherein the plant has been cultivated to maturity; and (b) collecting a broccoli from the plant.
 35. A method of producing a progeny plant comprising a single locus conversion, the method comprising obtaining a plant of line BRL 51-1128 comprising a single locus conversion and crossing the plant with a second broccoli plant, a sample of seed of said line BRL 51-1128 having been deposited under ATCC Accession No. PTA-9674. 